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Nick sent me this nice little article on 'The Art of Being Present', specifically with reference to dating!
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D 3 1 outline the method for dating rocks

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D.4.4 Outline the trends illustrated by the fossils of Australopithecus including A. The expected frequency of the heterozygous genotype is 2pq. D.5.5 Describe how the evolution of one species into another species involves the accumulation of many advantageous alleles in the gene pool of a population over a period of time. The chance of inheriting two copies of the second of the two alleles is (q)(q).However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.So, we rely on radiometric dating to calculate their ages.The Oxford English Dictionary cites Ælfric's tenth-century glossary, in which henge-cliff is given the meaning "precipice", or stone, thus the stanenges or Stanheng "not far from Salisbury" recorded by eleventh-century writers are "supported stones".

Legless lizards resemble snakes, but several common groups of legless lizards have eyelids and external ears, which snakes lack, although this rule is not universal (see Amphisbaenia, Dibamidae, and Pygopodidae).As a member, you'll also get unlimited access to over 55,000 lessons in math, English, science, history, and more.Plus, get practice tests, quizzes, and personalized coaching to help you succeed.The oldest preserved descriptions of snakes can be found in the Brooklyn Papyrus.Most species are nonvenomous and those that have venom use it primarily to kill and subdue prey rather than for self-defense. sapiens: .1 million years – large brain, flat face, reduced teeth, reduced robustness, chin D.5.4 State that adaptations (or micro-evolutionary steps) may occur as the result of an allele frequency increasing in a population over a period of time. p squared = frequency of homozygous dominants p squared = (.463)(.463) = .214 2pq = frequency of heterozygotes 2pq = 2 (.463)(.537) = .497 If there is random mating in a population, the chance of inheriting two copies of the first of the two alleles is (p)(p).